Superior Performance of Ag over Pt for Hydrogen Evolution Reaction in Water Electrolysis under High Overpotentials
Superior Performance of Ag over Pt for Hydrogen Evolution Reaction in Water Electrolysis under High Overpotentials
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DOI：
10.1021/acsaem.8b01777
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发表时间：
2019-01
影响因子：
6.4
通讯作者：
Jiaying Mo;B. Stefanov;Thomas H. M. Lau;Tianyi Chen;Simson Wu;Zhi-Qiang Wang;Xue-qing Gong;Ian W
中科院分区：
文献类型：
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作者：
Jiaying Mo;B. Stefanov;Thomas H. M. Lau;Tianyi Chen;Simson Wu;Zhi-Qiang Wang;Xue-qing Gong;Ian W
在世界范围内已经进行了大量的研究工作来开发用于从可再生能源生产H2的电解槽中的非贵金属催化剂。铂催化剂在典型的实验条件下具有最高的析氢反应活性，且酸性和过电位相对较低。然而，应注意的是，催化活性高度依赖于酸度和所施加的电位。在高工作负荷电解槽的真实的实践中，需要高酸度和大的负电位来优化HER活性。我们在此报道，当达到这样的条件时，在电解槽中采用不同的速率决定步骤，廉价的银催化剂，特别是立方形式的银纳米颗粒，可以清楚地表现出优于Pt的上级HER活性。这是由于表面的Ag-H键比Pt-H键弱，这更有利于H复合形成H2。因此，相信这项研究提供了新的见解，设计生态环境。
There has been a substantial research effort worldwide to develop non-noble metal catalysts in electrolyzers for H2 production from renewable energy sources. Pt catalysts are found to display the highest hydrogen evolution reaction (HER) activity under typical experimental conditions with relatively low acidity and overpotentials. However, it is noted that catalytic activity is highly dependent on acidity and applied potential used. In real practice of a high workload electrolyzer, high acidity and large negative potentials are required to optimize the HER activity. We hereby report that inexpensive silver catalysts, particularly the cubic form of silver nanoparticles, can clearly exhibit superior HER activity over Pt with a different rate-determining step in an electrolyzer when such conditions are reached. This is attributed to the weaker Ag–H bond at the surface than Pt–H which is more favorable for H recombination to form H2. It is thus believed that this study provides new insights into designing eco...